Originally Posted by Sarcothelia
Have fun replacing SIXTEEN bulbs at once. I honestly think that's a bad idea, you'll be spending ~15 dollars per bulb come replacement time, so I think it would be better to find either a single fixture or 2 4 bulb fixtures.
Unless they all died at once he would never have to do that. Once it gets around the time for bulb replacement he should be replacing them maybe 2-3 at a time, so his fish/corals (mostly corals) won't get shocked by the intesified lighting (not only from a newer bulb, but one that puts out more PAR at that).
I saw use the stock bulbs (assuming it comes with some) until around the time for replacement, and start replacing every 2 every week, that way you can also stagger the replacement times when you have to do that again